Title :
Beam transmission and emittance in the IPNS 50 MeV linac
Author :
Dooling, J.C. ; Brumwell, F.R. ; Donley, L.I. ; McMichael, G.E. ; Stipp, V.F.
Author_Institution :
Argonne Nat. Lab., IL, USA
Abstract :
In the Intense Pulse Neutron Source (IPNS) a 50-MeV Alvarez drift-tube linac has been in operation since 1961 when it was commissioned as the injector for the Zero Gradient Synchrotron. In 1983, the original IPNS Hsource was converted to a grooved-cathode, magnetron type providing reliable 40-50 mA operation at 30 Hz. Transmission losses in the 750 kV column, buncher, chopper, and transport line result in 25-30 mA of H- injected into the linac. Typically, the average current out of the linac is 10-12 mA with an overall efficiency of 35-40 percent. PARMILA studies along with a new energy and energy-spread diagnostic are being used to get a better understanding of emittance growth and beam-loss mechanisms. These studies examine the effect of injected energy, energy distribution and phase on the output beam in, terms of transmission efficiency, energy, and energy spread. Effects of variations in the linac electromagnetic quadrupole gradients on transmission and emittance are assessed in a similar manner
Keywords :
ion accelerators; linear accelerators; neutron sources; particle beam diagnostics; 200.07 MHz; 50 MeV; Alvarez drift-tube linac; IPNS; Intense Pulse Neutron Source; PARMILA; beam transmission; beam-loss; efficiency; emittance; energy spread; transmission efficiency; Apertures; Choppers; Laboratories; Linear particle accelerator; Monitoring; Neutrons; Particle beams; Performance loss; Propagation losses; Synchrotrons;
Conference_Titel :
Particle Accelerator Conference, 2001. PAC 2001. Proceedings of the 2001
Conference_Location :
Chicago, IL
Print_ISBN :
0-7803-7191-7
DOI :
10.1109/PAC.2001.987137
